Usage of "should" in speaking
 The modal verb "should" is used in speaking to convey several different ideas: Advice or Recommendation: "Should" is commonly used to give advice or make recommendations.    - "You should see a doctor if you're feeling unwell."    - "I think you should apologize to her for what you said." Expectation or Probability: "Should" can indicate what is expected or likely to happen.    - "The train should arrive at 3:00 PM, but there could be delays."    - "He should know the answer; he's been studying all week." Obligation or Duty: "Should" can express a sense of obligation or duty, although it is not as strong as "must."    - "I should finish this report before the deadline."    - "We should help those in need whenever we can." Conditional Statements: "Should" is often used in conditional statements to express what is expected to happen under certain conditions.   ...